School districts on the leading edge of the Birth through 3rd-Grade movement have demonstrated unprecedented success raising the achievement of low-income students by developing coherent strategies focused on the early years of learning and development. These communities aren’t merely improving preschool. Rather, they’re building high-quality early education systems that align services from birth through age 9. Two U.S. school districts on the leading edge of the Birth-3rd movement have shown striking results based on this approach.